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In page Umbrella:

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A large umbrella is displayed in each of the Basilicas of Rome, and a cardinal bishop who receives his title from one of those churches has the privilege of having an umbrella carried over his head in solemn processions. It is possible that the galero (wide-brimmed cardinal's hat) may derive from this umbrella.[citation needed] Beatiano, an Italian herald, says that "a vermilion umbrella in a field argent symbolizes dominion".